Display Chromaticity Calibration for Color Temperature Precision
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Solution Overview
Problem
Professional displaying devices often fail to meet high image quality requirements due to variations in light-source spectrum, particularly in color temperature and gamma brightness modes, necessitating calibration to achieve consistent image quality across batches.
Innovation Solution
An image-quality calibrating method that adjusts pixel components of color channels based on chromaticity measurements, involving coarse and fine adjustments to align actual chromaticity coordinates with standard values, and optionally includes peak brightness calibration through duty cycle adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If professional displaying devices use standard optical modules, then manufacturing cost and device complexity are reduced, but image quality and chromaticity precision cannot meet high professional requirements
Solution Approach 1:
The patent implements preliminary chromaticity measurement and calibration before the display device is put into use. A calibration module measures the actual chromaticity coordinates of red, green, and blue pixel units, calculates correction values in advance, and stores them in a lookup table. This preliminary calibration action eliminates the need for complex real-time adjustment mechanisms during normal operation, resolving the contradiction between achieving high precision and maintaining device simplicity.
Solution Approach 2:
The calibration system uses the display device's own pixel units as measurement objects. The calibration module measures chromaticity coordinates of the device's actual pixel units (red, green, blue) rather than requiring external reference standards. The system self-calibrates by comparing measured coordinates against standard values and applying correction values to the device's own pixel components, eliminating the need for complex external calibration equipment.
2Illumination intensity
If the display screen displays high brightness images, then visibility and image quality are improved, but color temperature deviation and chromaticity accuracy deteriorate
Solution Approach 1:
The patent implements dynamic chromaticity calibration that adapts to different brightness levels. The calibration module performs measurements and corrections at multiple brightness levels (including high brightness states), and the lookup table stores correction values corresponding to different grayscale levels. When the display operates at high brightness, the system retrieves and applies the appropriate correction values for that brightness level, maintaining color temperature accuracy across the full brightness range.
Solution Approach 2:
The patent changes the calibration parameters to account for brightness-level dependencies. Instead of using a single set of correction values, the system measures chromaticity coordinates at multiple brightness levels and creates brightness-level-specific correction tables. The system dynamically selects and applies the appropriate correction values based on the current brightness level, resolving the contradiction between high illumination intensity and color temperature accuracy.
3Manufacturing precision
If coarse adjustment is performed frequently to correct chromaticity deviations, then chromaticity coordinate accuracy is improved, but calibration time and processing duration increase
Solution Approach 1:
The patent segments the chromaticity correction process into two distinct stages: coarse adjustment and fine adjustment. The coarse adjustment stage uses large correction values to quickly bring chromaticity coordinates close to standard values, while the fine adjustment stage uses smaller correction values to achieve precise final accuracy. This segmentation allows the system to spend most time in the rapid coarse adjustment phase and minimal time in the precision fine adjustment phase, significantly reducing total calibration time while maintaining high precision.
Solution Approach 2:
The patent applies partial correction actions in a staged manner. Instead of applying the full correction value in a single step (which would be time-consuming and risk overshooting), the system first applies a partial correction (coarse adjustment) that achieves 80-90% of the required precision, then applies a smaller partial correction (fine adjustment) to reach the final precision target. This partial action approach balances speed and accuracy efficiently.
Data Source
AI summary
The present disclosure provides an image-quality calibrating method and system and a storage medium. The method includes: when a display screen is displaying a testing image, measuring the actually measured chromaticity coordinate of a target pixel unit in the image; according to a magnitude relation between the actually measured chromaticity coordinate and a standard chromaticity coordinate, by adjusting the pixel component of the target pixel unit, performing coarse adjustment to coordinate values of the actually measured chromaticity coordinate in a first direction and a second direction, and repeatedly performing the coarse adjustment till both of differences in the first direction and the second direction between the actually measured chromaticity coordinate obtained after the coarse adjustment and the standard chromaticity coordinate are less than a first preset value.